<template>
  <div class="login_container">
    <div class="login_box">
      <!-- logo区域 -->
      <div class="avator_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input placeholder="用户" prefix-icon="el-icon-search" v-model="loginForm.username"> </el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input placeholder="密码" prefix-icon="el-icon-search" v-model="loginForm.password" type="password"> </el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btn">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登陆表单绑定的数据对象
      loginForm: {
        username: '',
        password: ''
      },
      // 这是表单的验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置表单
    resetForm () {
      this.$refs.loginFormRef.resetFields()
    },
    // 登陆验证
    login () {
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登陆失败')
        this.$message.success('登陆成功')
        // 将登陆成功之后的token,保存到客户端的sessionStorage中
        // 项目中除了登陆之外的其他API接口,必须在登陆之后才能访问
        // token只应在当前网站打开期间生效,所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程式导航跳转路由页面
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;

  .login_box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    height: 300px;
    width: 450px;
    background-color: #fff;
    border-radius: 3px;

    .avator_box {
      width: 130px;
      height: 130px;
      border: 1px, solid, rgb(171, 171, 171);
      border-radius: 50%;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
    .login_form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }
    .btn {
      display: flex;
      justify-content: flex-end;
    }
  }
}
</style>
